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Where you can see the switch between stereo (STE), parallel and bridged. The specifications in this mode are 380W @ 8Ω / 240W @ 16Ω. You can't operate it safely on 4Ω in that mode. (Probably, the shortcut protection would just shut it down.)

Why do you say "You can't operate it safely on 4Ω in that mode"? How do you come to that conclusion? And where did you get "380W @ 8Ω / 240W @ 16Ω" from? Is that from a product specification/manual or past experience/testing?
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Adam LynchMay 1 '12 at 22:13

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Read the Wikipedia article. The channels of an amplifier in bridged mode (in which they're effectively wired in series) together have twice the power (fairly obvious), but they also require twice the speaker impedance.
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leftaroundaboutMay 1 '12 at 22:41